Street lighting lamp with long life, high efficiency, and high lumen maintenance

Abstract

A lamp includes a discharge vessel and electrodes extending into the discharge vessel. The lamp further includes an ionizable fill sealed within the vessel. The fill includes an inert gas and a halide component. The halide component includes a sodium halide, a thallium halide, at least one of a calcium halide and a strontium halide, and at least one of a rare earth halide. The rare earth (RE) halide is selected from the group consisting of lanthanum, cerium, praseodymium, samarium and neodymium, and combinations thereof. The fill establishes a Na / RE ratio of 8≰Na / RE≰48.

Description

technical field

[0001] The present disclosure relates to discharge lamps, and more particularly to high intensity discharge (HID) metal halide lamps made of transparent ceramic arc chamber material. HID lamps have particular application in street lighting, but it will be appreciated that selected aspects may have application in the context of related discharge lamps encountering the same problems with lumen efficacy and lumen maintenance. Background technique

[0002] High intensity discharge (HID) lamps are highly efficient lamps that can produce large amounts of light from a relatively small source. These lamps are widely used in many applications including road and road lighting, lighting of large venues such as stadiums, flood lighting of buildings, shops and industrial buildings, and projectors, to name a few. The term "HID lamp" is used to denote different kinds of lamps. These include mercury vapor lamps, metal halide lamps and sodium lamps. In particular, metal ha...

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